Boiler



Feb. 19 1924.

C. H. HOOK ET AL BOILER 1921 2 Sheets-Sheet 1 Filed May 14 MN MN Feb. 191924.

C. H. HOOK ET AL BOILER 2 Sheets-Sheet 2.

Filed May 14 WITNESSES, Mal/44g MATTORNEYS Patented Feb. 19, 1924.

UNETED CHARLES H0 37 ARI) HOOK AND ARNOLD 1V. MILLER, 0F FITTSBUIRGH,PENNSYLVANIA;

FAID MILLER; ASSIGNOR TO SAID ZEIQOK.

BOILER.

Application filed. may 14.,

To all whom it may concern Be it known that we, initiates H. HOOK andARNOLD W. MILLER, citizens of the United States, and residents ofPittsburgh, in the county of Allegheny and State of Pennsylvania, haveinvented a. new and useful Improvement in Boilers, of which thefollowing is a specification.

This invention relates to boilers. More particularly it relates toboilers such as are used in low pressure systems as for heat ingpurposes and the like.

The object of the invention is to provide novel means for supplying airin an updraft boiler. This object is attained by a construction whichproduces an upward circulation of air through the tire box, and whichintroduces supplementary air to the burning gases of combustion as theypass from' the fire box into the combustion chamber over the top of adouble fire wall. The ob jects and advantages which will be apparent tothose familiar with the art are attained by the construction describedin the following specification.

Referring to the drawings Fig. 1 is a diagrammatic central verticalsection through a sectional cast iron boiler embodying thisconstruction; Fig. 2 is a side elevation of one of the special sectionsused with the embodiment of the invention illustrated in Fig. 1. Thisfigure is also in effect a cross section through the boiler on the lineIIII of Fig. 1. Fig. 3 is a vertical section on the line IIIIII of Fig.2. Fig. l is a vertical sectional view through the section 1 of theboiler in a plane corresponding to the line TIT-III of Fig. 2.

To produce a smokeless boiler it is necessary to secure in the boiler acomplete cornbustion of the carbon gases given off by the heated fuel.This desirable result is attained in more or less degree by a variety ofconstructions. The most satisfactory one is what is known as thedown-draft boiler wherein the combustion is supported by a draft of airwhich passes downward through the burning fuel. This causes the carbongases to be carried through the bed of burn ing coals beneath the freshfuel, and effectively burns them. The objection to such boilers howeveris that they are more expensive to manufacture andv require moreskillful and careful stoking.

As a substitute for this downdraft boiler 1921. Serial no. 469.717 3 aVariety of constructions have been provided, which however do not drawthe air downward through the burning mass; In such boilers to secure acombustion of the gases suflicient to reduce the smoke. to the degreerequired by modern conditions, the gases of combustion after they passout of the fire box are conducted into a supplementary combustionchamber, into which is introduced an additional supply of heated air.The result is to consume in this combustion chamber a large amount ofthe car'- bon bearing gases which form smoke.

It is to this latter class of boilers that the present inventionrelates, and it is designed to furnish a novel, effective, andeconomical construction for practicing this rip-draft, combustionchamber, additional supply of air, method.

Figure 1 of the drawings shows in section, and diagrammatically, aboiler of the ordinary low pressure type such as is used for generatingsteam for heating purposes, The boiler illustrated, except for thespecial sections hereafter described, is typical of a well known makewhich is now on the market, and comprises a plurality of similarsections 1, each of which is formed from a unitary casting, havingitsmain body portion hollow, so that water may freely circulate thro-ughthe connected openings 2 at the bottom, and steam through the connectedopenings 2 at the top. The result is that when a plurality of thesesimilar sections are placed side by side and clamped together asillustrated in Fig. 1, they are water-tight, but are connected to eachother for the circulation of water and steam by means of the openings 2and 2, which register with each other and form central longitudinal passages through the bottom and top of the boiler, for the circulationandtransfer of water and steam, as is well understood.

A specially formed end section 3 is connected to the opening 2 on itsinner side, but its outer side l in alignment with the opening 2 isclosed. This section carries an external plate member 5 which closes.the flue passage 6, formed by aligned openings extending through themiddle portion of each of the sections 1 and 2. Beneath this opening 6in each section is a hollow cross member 7, through which water mayfreely circulate, and on each side of the opening 6 are hollow boundingwalls 8 and 9, through nace, without warping or distorting.

entirely across the inte which are additional. 10, I l 13. Beneath themember have that member conn r side wall portions by means 0'; $;T-sl lnecting pipes 15. This construclimi l the pur ose offurnlshan additionalheat- *w 1 ing surrace, and the specially shaped pi are for the purposeof and contraction of t when exposed to the intense heat oi the I1feature is covert. Patent llo. 91... granted to C. H. L h on July 12th,i910.

[it the bottoms of the sections 1, there are provided ordinary gratebars :30 e ztending across between the side walls of the units. Beneaththese grate bars tl re is formed an ash pit 2i, as will be rezvunoerstood. The end section 8 has a lire door 22, through which fuel isthrown into the fire box 23, formed by the centfal chamber bounded bythe grates 20, the side walls and of the units corresponding to the sidewalls i l and 2% of the special unit illustrated in Fig. 2, and theupper cross walls '7. A slice door 25, and a d...ft or ash door 26 arealso provided.

The inner end of the tire box is formed by a special section 1. Theupper portion of this section is the san'ie as that of the units 1, butbelow the cross wall. 7* there is provided a hollow partitioning portion30, integral with and extending downward from the middle portion of themember 7". This hollow partition extends downward, forming a narrowportion 30, for a short distance, and thou extends entirely across fromthe wall. i l to the wall 24 of the unit. This forms two openings 31 and32 over the top of the main body of the cross partition. This cross wallis hollow, so as to be water-cooled throughout. The bridge wall 33 is ofless thickness than the main body of the unit 1, and has one facedisposed a short cistance from the plane corresponding to the left handside of the unit, as viewed in Fig. 3, leaving a shoulder 34 for apurpose to be subsequently more fully described. A cooperating section lis pro vided, and this is similar in all respects to the section 1 abovedescribed, except that the partitioning member 33 is set over to theopposite side of the boiler section. Consequently, when the sections 1and 1 are placed in proper position, as illustrated in Fig. 1, with theshoulders 84 and 34 in abutment, there is left a space 35, extending lorof the boiler, which space is open at the bottom into the ash pit 21,and open across its top into the passages 31 and 32, which lead throughvthe bridge wall formed by partition members 33 and 33*, between the firebox: and the combustion chamber 36.

Beyond the section 1 is provided an ad- J v. s ower inc giates 20. A

ditional section 1, which has no grate bar, and which he a ssecial crossmember 7 permitting upward passage of gas to the p ages i0 to throughpassage '2'. yond tl is is provided a terminal section 1*, which has asolid end wall, with a single opening thcrethrough, adapted to receivethe terminal member 37 of a stack or chimney. The space 38 beyond thesection l and beneath the level of the grate 20 is filled with ashes, sothat effect y the bottom of the chamber 5% is level with the grates 20.

Z .0. operation of this boiler construction is as follows. Fuel isfurnished through the door to the box 23, and is ignited constant draftoi air through the steel; member 37, draws air upward from the ash pit21 through the grates 20, through the burning fuel. The burning gasespass upward and out of the fire b0 23 over the top of the bridge wall 33into the combustion chamber 36. They then pass out of the combustionchamber 36, are conducted back through the passages 10, 11, 12, and 13,thence into the central heat the hollow boiler construction forming thewalls of the passages through which the hot gases travel. As the burninggases pass from the lire box 23 over the top of the bridge wall members33 and 33 by means of the passages 31 and 32, a constant supply ofadditional air which is taken from the ash pit, and is thereforepro-heated, is supplied to and mixed with the gases of combustion justbefore they enter the combustion chamber 36. The result of this is tosupply the necessary additional oxygen to the gases after they leave thefire box, to complete the burning thereof in the combustion chamber. Bythe time the gases of combustion reach the stack 37, the carboncontained therein has been largely consumed, and the gases emer e in asubstan tially smokeless condition. In addition, this constructionincreases the heating efficiency of the lip-draft boilers, and permitsthe use of a shorter fire box.

We claim: k

1. In a boiler construction comprising a plurality of associatedsections forming a fire box having a closed top and a combustion chamberinto which the gases from the fire box must pass, the combination of.

two similar adjacent sections forming a partition across the end of thefire box and dividing it from the combustion chamber, the partitionextending upwardly from the bottom of the tire box and provided withportions stopping short of the top of said fire box, and an openingthrough the said partition from beneath the fire box into the combustionchamber, whereby to supply heated air from beneath the fire box to theburning gases as they pass from the fire box to the combustion chamber.

2. In a boiler construction comprising a plurality of associatedsections forming a fire box having a closed top and a combustionchamber, the combination of two similar adjacent sections havingpartitioning members extending across the fire box and upwardly from thebottom and provided with portions stopping short of the top thereof,said partitions of the two adjacent sections being spaced apart to forma transverse passage leading from beneath the fire box to the top of thesaid portions of the partitions, said partitions being provided withopenings establishing communication betwecn the said fire box andcombustion chamber.

3. In a sectional boiler construction comprising a fire box having aclosed top and a combustion chamber, two similar adjacent sectionsforming a bridge Wall dividing the fire box from the combustion chamberand comprising two cooperating partitions extending across the boilerfrom the level of the grate bars and provided With portions stoppingshort of the top of said fire box, said partitions being spaced apart toprovide a transverse passage therebetween, said passage opening beneaththe fire box and along the top of the said bridge wall.

In testimony whereof we hereunto sign our names.

CHARLES HOWARD HOOK. ARNOLD WV. MILLER. Witnesses:

W. R. MCCARTHY, H. E. GAMBRILL.

